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nir: Add lowering from ibitfield_extract/ubitfield_extract to shifts.

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V3D doesn't have opcodes for ibfe/ubfe, so we need to lower similarly to
glsl/lower_instructions.cpp.

Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
This commit is contained in:
Eric Anholt
2018-05-02 13:02:21 -07:00
parent 74618ccbca
commit af88acf4c4
2 changed files with 19 additions and 0 deletions
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3
src/compiler/nir/nir.h
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@@ -1903,7 +1903,10 @@ typedef struct nir_shader_compiler_options {
bool lower_fsqrt;
bool lower_fmod32;
bool lower_fmod64;
/** Lowers ibitfield_extract/ubitfield_extract to ibfe/ubfe. */
bool lower_bitfield_extract;
/** Lowers ibitfield_extract/ubitfield_extract to bfm, compares, shifts. */
bool lower_bitfield_extract_to_shifts;
/** Lowers bitfield_insert to bfi/bfm */
bool lower_bitfield_insert;
/** Lowers bitfield_insert to bfm, compares, and shifts. */

16
src/compiler/nir/nir_opt_algebraic.py
View File

@@ -539,6 +539,22 @@ optimizations = [
('ubfe', 'value', 'offset', 'bits')),
'options->lower_bitfield_extract'),
(('ibitfield_extract', 'value', 'offset', 'bits'),
('bcsel', ('ieq', 0, 'bits'),
0,
('ishr',
('ishl', 'value', ('isub', ('isub', 32, 'bits'), 'offset')),
('isub', 32, 'bits'))),
'options->lower_bitfield_extract_to_shifts'),
(('ubitfield_extract', 'value', 'offset', 'bits'),
('iand',
('ushr', 'value', 'offset'),
('bcsel', ('ieq', 'bits', 32),
0xffffffff,
('bfm', 'bits', 0))),
'options->lower_bitfield_extract_to_shifts'),
(('extract_i8', a, 'b@32'),
('ishr', ('ishl', a, ('imul', ('isub', 3, b), 8)), 24),
'options->lower_extract_byte'),